Systems and methods for securely streaming media content

ABSTRACT

Systems and methods are provided for securely providing a media stream from a server device to a remote player via a communications network. A request for a connection is received from the remote player at the server device via the communications network. In response to the request for the connection, an authorization credential is requested from a central server via the communications network. Further, in response to the authorization credential received from the central server, the media stream between the server device and the remote player can be established over the communications network. At least a portion of the media stream may be encrypted based upon the authorization credential.

PRIORITY CLAIM

This application is a continuation of U.S. patent application Ser. No.14/842,452, which is a continuation of U.S. patent application Ser. No.14/191,039 (No U.S. Pat. No. 9,143,827), which is a continuation of U.S.patent application Ser. No. 12/166,039 (now U.S. Pat. No. 8,667,279)filed Jul. 1, 2008.

TECHNICAL FIELD

The present invention generally relates to streaming of media content,and more particularly relates to systems and methods for improving thesecurity of media streaming.

BACKGROUND

Most television viewers now receive their television signals through acontent aggregator such as a cable or satellite television provider. Forsubscribers to a direct broadcast satellite (DBS) service, for example,television programming is received via a broadcast that is sent via asatellite to an antenna that is generally located on the exterior of ahome or other structure. Other customers receive television programmingthrough a cable, wireless or other medium. Programming is typicallyreceived at a receiver such as a “set top box” (STB) that demodulatesthe received signals and that converts the demodulated content into aformat that can be presented to the viewer on a television or otherdisplay.

More recently, consumers have expressed significant interest in “placeshifting” devices that allow viewing of television or other mediacontent at locations other than their primary television set. Placeshifting devices typically packetize media content that can betransmitted over a local or wide area network to a portable computer,mobile phone, personal digital assistant or other remote device capableof playing back the packetized media stream for the viewer.Placeshifting therefore allows consumers to view their media contentfrom remote locations such as hotel rooms, offices, or any otherlocations where portable media player devices can gain access to awireless or other communications network.

While placeshifting does greatly improve the convenience afforded to theviewer, the inherently insecure nature of many communications networks(such as the Internet) continues to pose challenges. That is, while itremains desirable to allow consumers to place shift their media playingexperience, it is also desirable to ensure that only authorized usersand players are allowed access to valuable media content.

It is therefore desirable to create systems and methods for securelyplaceshifting media content from a place shifting device to a remotemedia player. These and other desirable features and characteristicswill become apparent from the subsequent detailed description and theappended claims, taken in conjunction with the accompanying drawings andthis background section.

BRIEF SUMMARY

Various systems and methods are provided for securely providing aplace-shifted media stream from a place shifting device to a remoteplayer via a communications network. A request for a connection isreceived from the remote player at the place shifting device via thecommunications network. In response to the request for the connection,an authorization credential is requested from a central server via thecommunications network. Further, in response to the authorizationcredential received from the central server, the place-shifted mediastream between the place shifting device and the remote player can beestablished over the communications network. At least a portion of theplace-shifted media stream is encrypted based upon the authorizationcredential.

Other embodiments provide systems for securely providing a place-shiftedmedia stream to a remote player via a communications network. The systemcomprises a network interface to the communications network and areceiver interface to a medium separate from the communications network.A receiver is configured to receive media content from the receiverinterface, and a transcoder is configured to packetize the receivedmedia content for transport over the communications network. Controlcircuitry in communication with at least the network interface and thetranscoder is configured to receive a request for a connection from theremote player via the network interface, to request an authorizationcredential from a central server via the network interface in responseto the request for the connection, and, in response to receiving theauthorization credential from the central server via the networkinterface, to establish the place-shifted media stream to the remoteplayer via the network interface. In various embodiments, at least aportion of the place-shifted media stream may be encrypted based uponthe authorization credential.

Still other embodiments provide a method of presenting a place-shiftedmedia stream to a user of a remote device, wherein the place-shiftedmedia stream is provided from a place shifting device to the remotedevice over a communications network. The user is authenticated to acentral server via the communications network. Upon successfulauthentication with the central server, a connection to the placeshifting device is requested. Upon receiving a response from the placeshifting device, authorization is requested to connect to the placeshifting device from the central server via the communications network.An authorization response comprising an authorization credential isreceived from the central server via the communications network, and theplace-shifted media stream is established, In various embodiments, atleast a portion of the place-shifted media stream may be encrypted basedupon the authorization credential.

Still other embodiments provided a method of allowing a place-shiftedmedia stream to be provided to a user of a remote device, wherein theplace-shifted media stream is provided from a place shifting device tothe remote device over a communications network. A first request isreceived from the remote device via the communications network, whereinthe first request comprises a user credential associated with the user.The user credential is verified and, in response to successfulverification, a first response is transmitted to the remote device thatidentifies the place shifting device. An authentication credential isthen transmitted to the remote device in response to a second requestfrom the remote device and to the place shifting device in response to akey request from the place shifting device to thereby allow the remotedevice and the place shifting device to establish the place-shiftedmedia stream based at least in part upon the authentication credential.In various embodiments, at least a portion of the place-shifted mediastream may be encrypted based upon the authorization credential.

Various other embodiments, aspects and other features are described inmore detail below.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

Exemplary embodiments will hereinafter be described in conjunction withthe following drawing figures, wherein like numerals denote likeelements, and

FIG. 1 is a block diagram of an exemplary secure placeshifting system;

FIG. 2 is a block diagram of an exemplary placeshifting device;

FIG. 3 is a data flow diagram showing exemplary processes forestablishing secure placeshifting between a place shifting device and aremote device; and

FIG. 4 is a flowchart of an exemplary process for transmitting anencrypted media stream to the remote player.

DETAILED DESCRIPTION

The following detailed description of the invention is merely exemplaryin nature and is not intended to limit the invention or the applicationand uses of the invention. Furthermore, there is no intention to bebound by any theory presented in the preceding background or thefollowing detailed description.

Generally speaking, place shifting of media content is made more securethrough the use of various authentication and/or encryption features. Invarious embodiments, the place shifting device verifies that it has anapproved capability to provide placeshifting functions. Thisverification may be based upon “rights” set or modified on theplaceshifting device by a human. Alternatively, placeshifting “rights”may be set or modified based upon information received via a satellite,cable or other connection that also provides programming content to thedevice. In other embodiments, authentication in real-time (or nearreal-time) can be performed to authenticate the user to a central serverand/or to the placeshifting device, and/or to verify that the requestingremote player/device is authentic and approved to receive placeshiftedcontent. A credential-sharing environment may be further constructed sothat the transmitting and receiving devices receive cryptographic keysand/or other credentials from a secure central server. Theauthentication credentials provided from the central server can be usedto encrypt some or all of the placeshifted media stream. In variousfurther embodiments, the amount of encryption is adjusted based uponsuch factors as the quality of the video stream, the processingcapabilities of the remote media player, the bandwidth of theintervening communications links, and/or other factors as appropriate.The various concepts described herein may be deployed independently fromone another, or two or more may be combined with each other in anymanner to produce an even more secure place shifting environment.

The secure mechanisms described herein may find particular benefit whenused with hardware capable of both receiving television signals (e.g.,signal feeds from a satellite, cable, wireless or other source) and ofproviding the place shifting function. The invention is not so limited,however; to the contrary, the security features described herein may beused in conjunction with conventional placeshifting systems and devices,including those that interact with other external devices such astelevision receivers, removable media players, digital or personal videorecorders, and/or other sources of programming content.

Turning now to the drawing figures and with initial reference to FIG. 1,an exemplary placeshifting system 100 suitably includes a placeshiftingdevice 108 that packetizes media content for transmission to a remotedevice 112 over a communications network 102. In embodiments thatprovide enhanced security, a central server 114 that maintains adatabase 116 of information is also able to communicate withplaceshifting device 108 and remote device 112 via network 102. AlthoughFIG. 1 shows only a single placeshifting device 108, a single remotedevice 112 and a single central server 114, in practice system 100 mayinclude any number of servers 114 that are able to interact withhundreds, thousands or even more placeshifting device 108, each of whichmay be able to stream media content to any number of different remotedevices 112.

Network 102 is any digital or other communications network capable oftransmitting messages between senders and receivers. In variousembodiments, network 102 includes any number of public or private dataconnections, links or networks supporting any number of communicationsprotocols. Network 102 may include the Internet, for example, or anyother network based upon TCP/IP or other conventional protocols. Invarious embodiments, network 102 also incorporates a wireless and/orwired telephone network, such as a cellular communications network forcommunicating with mobile phones, personal digital assistants, and/orthe like. Network 102 may also incorporate any sort of wireless or wiredlocal area networks, such as one or more IEEE 802.3 and/or IEEE 802.11networks. Placeshifting device 108 is therefore able to communicate withremote device 112 in any manner. Such communication may take place overa wide area link that includes the Internet and/or a telephone network,for example; in other embodiments, communications between devices 108and 112 may take place over a wired or wireless local area linkincorporated within network 102, with messages to central server 114taking place over a wide area link also incorporated within network 102.

Placeshifting device 108 is any component, hardware, software logicand/or the like capable of transmitting a packetized stream of mediacontent over network 102. In various embodiments, placeshifting device102 incorporates suitable transcoder logic to convert audio/video orother media data into a packetized format that can be transmitted overnetwork 102. The media data may be in any format, and may be receivedfrom any source such as a broadcast, cable or satellite televisionprogramming source, a “video-on-demand” or similar source, a digitalvideo disk (DVD) or other removable media, a video camera, and/or thelike. In various embodiments, placeshifter device 108 is any of thevarious SLINGBOX products available from Sling Media of Foster City,Calif., which are generally capable of receiving media content from anexternal digital video recorder (DVR), set top box (STB), cable orsatellite programming source, DVD player, and/or the like.

In further embodiments, placeshifter device 108 may also include contentreceiving capabilities. That is, device 108 may be a hybrid STB or otherreceiver that also provides transcoding and placeshifting features, asdescribed more fully below. Such a device may receive satellite, cable,broadcast and/or other signals that encode television programming 105from an antenna 104, modem, server and/or other source. The receiver mayfurther demodulate or otherwise decode the received signals 105 toextract programming that can be locally viewed and/or place shifted to aremote viewer 112 as appropriate. Such devices 108 may also include acontent database 110 stored on a hard disk drive, memory, or otherstorage medium to support a personal or digital video recorder (DVR)feature as appropriate.

In the exemplary embodiment illustrated in FIG. 1, placeshifting deviceis a hybrid receiver/transcoder that receives digital broadcastsatellite (DBS) signals 105 from a satellite 106 at an antenna 104.Equivalent embodiments, however, could receive programming 105 from acable connection, broadcast source, removable media, service provideraccessible via network 102, any external device and/or the like. Inembodiments that include DVR functionality, programming may be stored indatabase no as desired (e.g., in response to user/viewer programminginstructions) for subsequent viewing on a television or other displaylocated in relatively close proximity; programming need not be stored inall instances or embodiments, however, and programming could bealternately provided in real time. As noted above, content may bepresented on a television or other display that is physically connectedto device 108, or may be placeshifted from device 108 to a remote device112 over network 102.

Remote device 112 is any device, component, module, hardware, softwareand/or the like capable of receiving a media stream from placeshiftingdevice 108. In various embodiments, remote device 112 is personalcomputer (e.g., a “laptop” or similarly portable computer, althoughdesktop-type computers could also be used), a mobile phone, a personaldigital assistant, a personal media player (such as the ARCHOS productsavailable from the Archos company of Igny, France) or the like. In manyembodiments, remote device 112 is a general purpose computing devicethat includes a media player application in software or firmware that iscapable of securely connecting to placeshifting device 108, as describedmore fully below, and of receiving and presenting media content to theuser of the device as appropriate.

Many different placeshifting scenarios could be formulated based uponavailable computing and communications resources, as well as consumerdemand. In various embodiments, consumers may wish to placeshift contentwithin a home, office or other structure, such as from a placeshiftingdevice 108 to a desktop or portable computer located in another room. Insuch embodiments, the content stream will typically be provided over awired or wireless local area network operating within the structure. Inother embodiments, consumers may wish to placeshift content over abroadband or similar network connection from a primary location to acomputer or other remote device 112 located in a second home, office,hotel or other remote location. In still other embodiments, consumersmay wish to placeshift content to a mobile phone, personal digitalassistant, media player, video game player, automotive or other vehiclemedia player, and/or other device via a mobile link (e.g., a GSM/EDGE orCDMA/EVDO connection, an IEEE 802.11 “Wi-fi” link, and/or the like).Several examples of placeshifting applications available for variousplatforms are provided by Sling Media of Foster City, Calif., althoughthe concepts described herein could be used in conjunction with productsand services available from any source.

As noted at the outset, it is generally desirable to maintain securityof the placeshifting process to ensure that unauthorized users andunauthorized players do not gain access to programming content. This isparticularly true when placeshifting device 108 is an integratedreceiver/DVR/placeshifter, since the amount of valuable contentavailable within the device could be significant. To maintain thesecurity of the connection, then, various embodiments establish alogical barrier around a trusted domain or authorized zone 120, whichmay include the placeshifter device 118 itself, as well as any backendservers 114, 118 that are maintained by service providers or othertrusted entities. By requiring users to interact within a secureinfrastructure 100, suitable authentication or other security mechanismscan be implemented to prevent unauthorized access to resources containedwithin trusted domain 120.

To that end, a service provider may provide a central server 114 thatinteracts with placeshifting device 108 and/or mobile device 112 overnetwork 102. Server 114 is any computer system or other computingresources that are able to respond to process requests for informationreceived via network 102. Server 114 may, for example, maintain adatabase 116 that includes user account information, as well ascryptographic keys or other authentication credentials associated withthe various placeshifting devices 108 as appropriate.

Central server 114 facilitates secure transactions between the remotedevice 112 and the placeshifting device 108 in any manner. In variousembodiments, users of remote devices 102 are able to locateplaceshifting devices 108 on network 102 by contacting central server114, authenticating to server 114 with a userid/password pair or othercredential, and then receiving information that allows a subsequentconnection request to one or more placeshifting devices 108 associatedwith the user in database 116. The remote device 112 is then able tocontact the placeshifting device 108 directly via network 102 to requesta connection. Upon receiving connection requests from both placeshiftingdevice 108 and remote device 112, central server 114 suitably provides acryptographic key or other credential that can be used to establish asecure media stream between devices 108 and 112, as appropriate, and asmore fully described below. Central server 114 is therefore able togreatly assist in maintaining the security of the placeshifted mediastream, even though the server 114 need not be logically or physicallyinterposed between the communicating devices 108 and 112.

In further embodiments, a server 114 involved with user authenticationand/or key management may communicate with one or more backend servers118 for additional security. Backend server 118 may have access tobilling information, for example, that can be cross-checked againstinformation received at server 114 to ensure that the user requestingservices has properly paid for such services, has maintained an accountin good standing, and/or the like. Queries to backend server 118 may beprocessed in real-time (or near real-time) over a secure link apart fromnetwork 102. In various embodiments, backend server 118 may beaffiliated with a provider of satellite or cable television signals todevice 108, for example. In such embodiments, server 118 could be usedto ensure billing compliance, but could additionally (or alternatively)enable further services to the user in any manner. For example, a userauthenticated with server 114 could order services (e.g., enablement ofplaceshifting features), issue an instruction to purchase a pay-per-viewprogram or to record a program on a DVR associated with device 108, paya bill, and/or take some other action with respect to the user's accountwith backend server 118 through the convenience of network 102. Inembodiments wherein the user has ordered additional services or content,server 118 may coordinate messages transmitted via satellite 116 (or,equivalently, a cable connection or the like) to update settings ondevice 108 as appropriate. Because a secure connection within trusteddomain 120 exists from server 114 to placeshifting device 108, newservices and features can be enabled without data transmissions acrossrelatively unsecured network 102.

FIG. 2 provides additional detail about an exemplary placeshiftingdevice 108 that includes a receiver 208, a decoder 214 and aplaceshifting transcoder 204, as appropriate. Although FIG. 2 describesa hybrid device 108 capable of receiving and decoding content inaddition to placeshifting, the concepts set forth herein could beequivalently applied to devices 108 that simply provide placeshifting ofmedia content received and/or decoded at an external receiver, DVR,media player, server and/or the like. Other embodiments may incorporateadditional or alternate processing modules from those shown in FIG. 2,may omit one or more modules shown in FIG. 2, and/or may differentlyorganize the various modules in any other manner different from theexemplary arrangement shown in FIG. 2.

Device 108 may be logically and physically implemented in any manner.FIG. 2 shows various logical and functional features that may be presentin an exemplary device 108; each module shown in the figure may beimplemented with any sort of hardware, software, firmware and/or thelike. Any of the various modules may be implemented with any sort ofgeneral or special purpose integrated circuitry, for example, such asany sort of microprocessor, microcontroller, digital signal processor,programmed array and/or the like. Any number of the modules shown inFIG. 2, for example, may be implemented as a “system on a chip” (SoC)using any suitable processing circuitry under control of any appropriatecontrol logic 205. In various embodiments, control logic 205 executeswithin an integrated SoC or other processor that implements receiver208, transport selector 212, decoder 214, display processor 218 and/ordisk controller 206, as appropriate. In such embodiments, the integratedSoC processor may interact with a transcoder module 204 implemented witha separate processor as well as any other input or output devices toproduce desired outputs based upon inputs received from local or remoteusers. In other embodiments, transcoder 204 may also be incorporatedinto the SoC design. Broadcom Corporation of Irvine, Calif., forexample, produces several models of processors (e.g., the model BCM 7400family of processors) that are capable of supporting SoC implementationsof satellite and/or cable receiver systems, although products from anynumber of other suppliers could be equivalently used. In still otherembodiments, various distinct chips, circuits or components may beinter-connected and inter-relate with each other to implement thereceiving and decoding functions represented in FIG. 2.

Various embodiments of device 108 therefore include any number ofappropriate modules for obtaining and processing media content asdesired for the particular embodiment. Each of these modules may beimplemented in any combination of hardware and/or software using logicexecuted within any number of semiconductor chips or other processinglogic.

Various embodiments of control logic 205 can include any circuitry,components, hardware, software and/or firmware logic capable ofcontrolling the various components device 108. Various routines, methodsand processes executed within device 108 are typically carried out undercontrol of control logic 205, as described more fully below. In manyembodiments, the various security and authentication features describedwith respect to FIG. 3 below are carried out primarily within controllogic 205, which may be executing on any processor within device 108.

As noted above, many embodiments of device 108 include a receiver 208,which is any hardware, software, firmware and/or other logic capable ofreceiving media content via one or more content sources 105. In variousembodiments, content sources 105 may include cable television, DBS,broadcast and/or other programming sources as appropriate. Receiver 208appropriately selects a desired input source and provides the receivedcontent to an appropriate destination for further processing. In variousembodiments, received programming may be provided in real-time (or nearreal-time) to a transport stream select module 212 or other componentfor immediate decoding and presentation to the user. Alternatively,receiver 208 may provide content received from any source to a disk orother storage medium in embodiments that provide DVR functionality. Insuch embodiments, device 108 may also include a disk controller module206 that interacts with an internal or external hard disk, memory and/orother device that stores content in a database 110, as described above.

In the embodiment shown in FIG. 2, device 108 also includes anappropriate network interface 210, which operates using anyimplementation of protocols or other features to support communicationby device 108 on network 102. In various embodiments, network interface210 supports conventional LAN, WAN or other protocols (e.g., the TCP/IPor UDP/IP suite of protocols widely used on the Internet) to allowdevice 108 to communicate on network 102 as desired. Network interface210 typically interfaces with network 102 using any sort of LAN adapterhardware, such as a conventional network interface card (NIC) or thelike provided within device 108.

Transport stream select module 212 is any hardware and/or software logiccapable of selecting a desired media stream from the available sources.In the embodiment shown in FIG. 2, stream select module 212 is able togenerate video signals for presentation on one or more output interfaces228. In various embodiments, stream select module 212 is also able toprovide an encoded video signal 236 to transcoding module 204, althoughthis feature is entirely optional. In such embodiments, however,transcoding module 204 would decode the video signal 236 for packetizingand subsequent transmittal over network 102, as described elsewhere.

More typically, however, stream select module 212 responds to viewerinputs (e.g., via control logic 205) to simply switch encoded contentreceived from a live source 105 or from storage no to one or moredecoder modules 214. Device 108 may include any number of decodermodules 214 for decoding, decompressing and/or otherwise processingreceived/stored content as desired. Generally speaking, decoder module214 decompresses or otherwise processes received content from streamselect module 212 to extract an MPEG or other media stream encodedwithin the stream. The decoded content can then be processed by adisplay processor modules 218 to create a display for the viewer in anyappropriate format.

Display processor module 218 includes any appropriate hardware, softwareand/or other logic to create desired screen displays at interfaces 242,244, 246 as desired. In various embodiments, display processing module218 is also able to produce on screen displays (OSDs) for electronicprogram guide, setup and control, input/output facilitation and/or otherfeatures that may vary from embodiment to embodiment. Such displays arenot typically contained within the received or stored broadcast stream,but are nevertheless useful to users in interacting with device 108 orthe like. The generated displays, including received/stored content andany other displays may then be presented to one or more outputinterfaces 228 in any desired format. In various embodiments, displayprocessor 218 produces an output signal encoded in any standard format(e.g., ITU656 format for standard definition television signals or anyformat for high definition television signals) that can be readilyconverted to standard and/or high definition television signals atinterface 228.

In hybrid receiver/placeshifter devices 108, a hardware or softwareswitch 226 may also be provided that allows one or more output channelsto be diverted to a transcoding module 204 for placeshifting overnetwork 102. In such embodiments, switch 226 suitably re-directs outputfrom one of the output channels (e.g., channel 228) in decoded anddecompressed form to the transcoding module 204 as appropriate. Anoutput signal encoded in ITU656 format, for example, may be provided asan input to transcoding module 204 to support digital-to-digitalconversion to a media format that can be readily transmitted on network102. In other embodiments, digital or analog signals may be provided totranscoder 204 in any format.

To that end, transcoding module 204 is any hardware, software, firmwareand/or combination thereof that is capable of producing a media streamcapable of being routed on network 102 to a remote device 112. Invarious embodiments, transcoding module is implemented in asemiconductor chip having digital signal processing capabilities, suchas a DAVINCI model processor available from the Texas InstrumentsCorporation of Dallas, Tex., although other embodiments may use any sortof processor or other circuitry (including the same processor or othercircuitry used to implement any other components shown in FIG. 2) toimplement the transcoding function. Generally speaking, transcodingmodule 204 receives either a decoded signal 234 decoded by decoders 214or 216 (and optionally further processed by display processors 218 or220) or an already encoded stream 236, performs a digital-to-digitalconversion to create a media stream in a desired format and havingdesired parameters, and provides the converted stream for transport onnetwork 102. One example of a placeshifting system that includestranscoding capabilities is described in U.S. Patent Publication2006/0095471, although other placeshifting and/or transcoding featuresmay be implemented in a wide array of alternate embodiments. FIG. 2shows the output 238 of transcoding module 204, which includes theplaceshifted video stream, as being provided for transport using networkinterface 210. In an alternate embodiment, a different network interface210 could be provided, such as a stack residing within module 204itself. In various embodiments, it may be desirable to secure anyinter-chip communications between transcoding module 204 and othercomponents of device 108 through any sort of physical or logicalsecurity techniques. Signals 234, 236 and/or 238 may be provided onsignal pins that are physically embedded within a printed circuit board,for example, to make access to such signals more difficult. Further,signals 234, 236 and/or 238 may be encrypted or encoded between modulesin any manner to prevent unauthorized usage in the event that suchsignals are physically intercepted.

In operation, then, placeshifting device 108 suitably receives one ormore media streams from a DBS, cable or other source 105, which may bestored in a DVR database 110 or the like as desired. Received and/orstored content may be provided in compressed form (e.g., signal 236)and/or decompressed form (e.g., signal 234) to transcoding module 204,which appropriately converts the received signals to a format that canbe transmitted to the remote device 112 over network 110. Control of theplaceshifting process, including any communications related to securityor authentication, may take place under the direction of control logic205 executing within device 108.

FIG. 3 shows an exemplary process 300 for securely establishing aplaceshifting media stream between a placeshifting device 108 and aremote device 112. FIG. 3 shows messages sent and received by each ofthe entities 108, 112, 114 involved in the security process 300, as wellas other actions that may be performed by one or more entities withinsystem 100 (FIG. 1). In practice, the overall process 300 may beimplemented with various methods executed by one or more entities 108,110, 112, as described more fully below. Generally speaking, each of themethod steps shown in FIG. 3 may be implemented in software or firmwarethat may be stored in memory, mass storage or any other storage mediumavailable to the executing device, and that may be executed on anyprocessor or control circuitry associated with the executing device.

Process 300 typically begins with the remote device 112 contacting thecentral server with a login request (step 302). This may be initiatedby, for example, a user of remote device 102 opening a media playerapplication, or otherwise initiating the process of viewing placeshiftedmedia. Step 302 may include providing any sort of identifyinginformation associated with the user, such as any sort ofuserid/password pair. Alternatively, step 302 could provide a digitalsignature, any other cryptographic credential, biometric information,and/or any other sort of identifying information to ensure the identityof the user. Step 302 may also include a digital signature, identifieror other credential associated with a media player application or othercomponent of device 112 to ensure that the application is authorized toparticipate in process 300. Central server 114 suitably validates thereceived information (step 303) in any manner (e.g., by queryingdatabase 116 in FIG. 1). If validation is successful, the user isidentified, and a response message may be sent (step 304). In the eventthat the media player application is out of date, such information maybe used to prompt the user to obtain updated software, or for any otherpurpose.

Response message 304 includes any information that allows the remotedevice to establish a connection to a desired placeshifting device 108.In various embodiments, response 304 may include address information(e.g., an Internet Protocol (IP) address) relating to one or moreplaceshifting devices 108 associated with the user's account in adirectory or other listing. The response 304 may also include userpreferences or other settings established by the user for addedconvenience.

Upon successful authentication with the central server 114, the remotedevice 112 is able to request a connection to a particular placeshiftingdevice 108 via network 102 (step 306). This request may be sent usingany suitable protocol or other format that can be received aninterpreted by placeshifting device 108. In an exemplary embodiment,response 304 includes an IP address or other identifier associated withthe placeshifting device 108 that allows the remote device 112 tocontact the desired placeshifting device 108 directly via network 102.

Placeshifting device 108 is able to verify the capability to performplaceshifting in any manner (step 307). In various embodiments, device108 receives a flag or other indication via a separate data connectionother than network 102 that indicates availability of placeshifting“rights”. For example, in embodiments wherein device 108 includes theability to receive cable or satellite signals, a placeshiftingenablement message may be embedded within signals 105 transmitted todevice 108 via the cable or satellite connection, respectively. In otherembodiments, a human physically close to device 108 may be alerted bydevice 108 to authorize placeshifting. In either case, device 108 maynot accept placeshifting requests until placeshifting “rights” areexpressly enabled on the device. This may be verified by checking thatplaceshifting is approved (step 307) just prior to validating the user'srequest for connection, as shown in FIG. 3, or by simply ignoringrequests 306 for placeshifting connections until approval forplaceshifting is received.

Placeshifting may be enabled or disabled in any manner, and/or may bedifferently applied based upon the location or capabilities of remotedevice 112. For example, placeshifting device 108 may be configured torecognize several “tiers” of service so that placeshifting is enabledonly for local area networks, for example, or only for wide areanetworks. Such functionality may be implemented by comparing IP or othernetwork addresses of devices 108 and 112, for example, when limitedplaceshifting is enabled. Placeshifting within any particular device 108may be enabled, disabled, or otherwise adjusted in any manner and on anytemporal basis by simply updating the placeshifting “flag” or other dataprovided to device 108.

If placeshifting is enabled on device 108, then a response message 308is sent to remote device 112 via network 102. In various embodiments,device 112 also submits a request 312 to central server 114 for anauthorization credential that can be used to secure the placeshiftedmedia stream, as described below. Upon receipt of response 308 fromplaceshifting device 108, remote device 112 also submits a request 310to central server 114 to obtain the authorization credential thatpermits secure communication with the particular placeshifting device108. In various embodiments, the authorization credential is acryptographic key, such as a symmetric encryption key or the like thatpermits subsequent secure communications based upon a shared secret.Conventional keys of any length (e.g., 64 or 128 bits) associated withadvanced encryption standard (AES) or data encryption standard (DES)algorithms, for example, could be used in various embodiments. Invarious embodiments, the authorization credential is associated with theparticular placeshifting device 108, and may be updated on any temporalbasis. Keys may be updated on a periodic or aperiodic basis, forexample, or a unique key may be provided in response to each request 312for added security.

Upon receiving requests 310 and 312, central server 114 suitablyvalidates and authorizes the placeshifting session (step 314). Step 314may involve querying a backend server 118, for example, to ensure thatthe placeshifting is approved for the particular user, remote device 112and/or placeshifting device 108. Alternatively, verification may beresolved locally at central server using database 116 (FIG. 1) or thelike. If the transaction is approved, then the authorization credentialis transmitted from server 114 to the remote device as message 316, andto the placeshifting device 108 as message 318. In embodiments whereinthe credential is already stored within device 108, message 318 may notnecessarily include another copy of the credential, but may insteadprovide an indication that placeshifting with remote device 112 isapproved. Authorization credentials will typically be provided usingrelatively secure connections (e.g., secure hypertext transport protocol(HTTPS) or the like) to prevent any third parties from obtaining thecredential through eavesdropping or similar techniques.

When both placeshifting device 108 and remote device 112 have receivedauthorization 316, 318 from the central server 114, then a secureconnection may be established directly between the two devices 108, 112via network 102. A session key 320 may be generated by each party, forexample, using conventional techniques (e.g., as set forth in the AES,DES or other algorithms) and using parameters provided from centralserver 114. This session key may be based upon the receivedauthentication credential, for example, to allow for mutualencryption/decryption of ensuing communications. The session key istypically negotiated based upon the received credential, and also basedupon one or more other parameters known to the communicating devices.These parameters may be embedded within software previously provided(e.g., within a media player application provided to device 112, and/orwithin a firmware update to device 108) to further enhance placeshiftingsecurity. These parameters may be defined in any manner (e.g., inaccordance with well-known encryption protocols such as AES, DES and/orthe like) and may be updated on any temporal basis. In the event thatthe cryptographic systems described in FIG. 3 become compromised, forexample, a firmware update to device 108 and/or a player update todevice 112 may be required to update the various parameters prior toreceiving any future approvals (e.g, messages 316, 318) from centralserver 114.

In various embodiments, a user of remote device 112 may alsoauthenticate separately with placeshifting device 108 (step 324) tofurther enhance the security of process 300. This authentication mayinvolve providing a userid/password pair, a digital signature, biometricdata, and/or any other identifying information associated with the userto placeshifting device 108. Such information may be configured by theuser prior to establishing the placeshifting session in any manner.Although FIG. 3 shows authentication step 324 as occurring afternegotiation of the session key, such authentication may take place atany point within process 300. Authentication 324 may take place prior toplacing of key request 312, for example. Other embodiments may eliminatethe additional authentication in step 324 entirely, or make suchauthentication optional at the discretion of the user or anyadministrator.

When authentication is complete and the various encryption parametersare properly in place, the placeshifting media stream 326 can beprovided over network 102 to remote device 102. Typically, some or allof the content contained within media stream 326 is encrypted (step325), as described more fully below. Transcoding, encryption andtransmission of content in media stream 326 may be adjusted in anymanner during operation (step 328). In various embodiments, the mediaplayer application associated with remote player 112 provides commandand control information to device 108 that may be used to adjust orotherwise control transcoding, encryption or transmission as desired.

From the varying perspectives of devices 108, 112 and central server114, then, various methods for establishing a secure placeshiftingsession are described in FIG. 3. With respect to placeshifting device108, for example, establishing a secure connection suitably includes thebroad steps of receiving a request for connection 306 from the remotedevice, verifying that a placeshifting feature is available withindevice 307, and then requesting approval for the session from thecentral server (step 312). In response to the received approval (step318), which may include a cryptographic key or other authenticationcredential, placeshifting device 108 is able to establish the securemedia stream 326 based upon the received credential. The various stepsof this method may be carried out by any processing circuitry or logicassociated with device 108, including control logic 205 shown operatingin FIG. 2.

With respect to the remote device 112, an initial request is placed tocentral server 114, which responds 304 with an address or otherinformation about placeshifting device 108. The remote device 112 isthen able to request a connection (step 306) from the placeshiftingdevice, and to request the key or other credential upon receipt of aresponse 308 from device 108. The received credential can then be usedto negotiate or otherwise establish the parameters of the secure mediastream 326, and to decrypt the content transferred as part of thestream. The various steps of this method may be executed within a mediaplayer application or other software executing on remote device 112.

With respect to the central server 114, the initial request 302 isreceived from remote device 112 and validated (step 303) as appropriate.If the request is valid, information about the placeshifting device 108is provided (step 304) to allow the remote device 112 to contact theplaceshifting device 108 directly. Upon receipt of subsequent requests310, 312 from device 112, 108 (respectively), central server 114suitably validates and authorizes the session in any appropriate manner,and transmits the key or other authentication credential to the remotedevice 112 and/or placeshifting device 112 in any manner. Devices 108and 112 are then able to independently negotiate the parameters of thesecure media stream 326 based upon the shared credential. The variousfunctions and other features of this method may be executed on one ormore processors associated with server 114 and/or backend server 118(FIG. 1), as appropriate.

FIG. 4 shows additional detail about an exemplary technique fortransmitting a secure media stream 326 from a placeshifting device 108to a remote device 112. The various steps shown in FIG. 4 may beexecuted in software, firmware and/or hardware logic residing withindevice 108, such as control logic 205 shown operating in conjunctionwith the various other modules (including transcoder module 204) in FIG.2.

As noted above, placeshifting device 108 receives authenticationcredentials (e.g., a cryptographic key) in any manner (step 402). Uniquecredentials may be provided for each requested session in someembodiments, or a key/credential may be securely stored within device108 for use in conjunction with multiple placeshifting sessions. Ineither event, a session key and/or other parameters for a particularplaceshifting session may be negotiated with remote device 112 (step404) based upon the secret information shared between the two devicesusing any technique, such as conventional AES cryptography.

In some embodiments, resources may be available to encrypt the virtualentirety of media stream 326. In other embodiments (step 406), however,it may not be necessary or desirable to encrypt the entire stream. Inembodiments wherein the transcoded media stream is of relatively lowquality (e.g., a relatively low bit resolution) in comparison to thereceived signal, for example, cryptography may be reduced or eliminated.Further, when the remote device has limited computing resources (e.g, amobile phone or the like), the computational demands of strongcryptography may detract from the user experience. Similarly, if themedia stream 326 is being transferred over a relatively low bandwidthlink (e.g, a relatively slow telephone connection), the added delayimposed by cryptography may be undesirable. As a result, the level ofcryptography applied by the placeshifting device may be selected (step408) based upon such factors as the quality of the transmitted mediastream, the processing capabilities of remote device 112, and/or thebandwidth of the intervening communications network 102.

Cryptography may be applied in any manner (step 410). In variousembodiments, cryptography may be applied in any number of “levels”,ranging from no encryption, to partial encryption, to encryption of theentire stream depending upon the various factors. “Partial encryption”in this sense can refer to encrypting only certain frames of the mediastream, and/or to encrypting only certain blocks of one or more frames.That is, by encrypting only a portion of the transmitted media, securitycan be maintained without unduly increasing computational overhead. In aconventional MPEG-type video stream, for example, the more fundamentalvideo frames (e.g., I-frames) can be encrypted, with reduced encryptionapplied to the more heavily compressed frames (e.g, P-frames and/orB-frames). Encrypting only a portion of the macroblocks making up thevarious frames can similarly reduce computational demands. As oneexample, a “high” level of encryption could encrypt every outgoing frameof media stream 326, whereas a “medium” level could encrypt a lesseramount, for example between 25-75 percent or so of the blocks in some orall of the I, P and/or B frames. Additional levels could be added forany level of resolution desired.

In further embodiments, the particular blocks that are encrypted couldbe assigned in any manner, including randomly. That is, the particularblocks may be randomly selected to further enhance the security of thesystem. Randomizing the encrypted blocks could have a further advantagein terms of spreading processor loading as well, thereby furtherimproving system performance during encryption. The particularrandomly-selected blocks may be called out to the receiving party in anymanner, such as through header identification, control messages and/orthe like to facilitate efficient decryption of media stream 326.

Media stream 326 is therefore encrypted and transmitted to remote device108 in any manner (step 412) until the placeshifting session is complete(step 414). As noted above, various transcoding, encryption and/ortransmission parameters of stream 326 may be adjusted during operationas desired (step 416). If the bandwidth of the connection 102 shoulddegrade, for example, or the processing capabilities of remote device112 become overloaded, it may be desirable to reduce the quality of themedia stream and/or to reduce the amount of encryption applied in step410. Any of the various parameters used in transcoding and/or encryptingmedia stream 326 may be adjusted upwardly or downwardly as appropriateto compensate for changing conditions (step 418). In an exemplaryembodiment, the encryption level may be set and/or adjusted according tothe video bitrate and/or video resolution. High definition video, forexample, may always be encrypted at a relatively high level, whereasstandard definition video may be encrypted at lower levels in someembodiments, particularly if the video bitrate is relatively low.Various encryption parameters and criteria could be established across awide range of alternate embodiments.

Using the various systems, methods and other concepts described herein,a number of advantages may be achieved. By requiring authentication to acentral server and/or to the placeshifting device, for example, accessto placeshifted content can be limited to authorized users. Moreover, byunauthorized media player applications can be rejected throughauthentication to the central server and/or the use of system secretsfor generating session keys. The use of a central server allows forconvenient upgrading/updating of keys or player applications in theevent of security breach, thereby greatly enhancing system renewability.Moreover, streaming content is encrypted end-to-end, thereby reducingaccess by untrusted or unapproved third parties. The level of encryptionapplied may be adjusted based upon video quality, environmental factorsand/or the like, further improving system performance. As noted at theoutset, the various features may be selectively applied, and not allfeatures will be found in all embodiments.

As used herein, the word “exemplary” means “serving as an example,instance, or illustration.” Any implementation described herein asexemplary is not necessarily to be construed as preferred oradvantageous over other implementations.

While the foregoing detailed description will provide those skilled inthe art with a convenient road map for implementing various embodimentsof the invention, it should be appreciated that the particularembodiments described above are only examples, and are not intended tolimit the scope, applicability, or configuration of the invention in anyway. To the contrary, various changes may be made in the function andarrangement of elements described without departing from the scope ofthe invention.

What is claimed is:
 1. A method for securely providing a media streamfrom a server device to a remote player via a communications network,the method comprising: receiving, at the server device, a request for aconnection from the remote player via the communications network; inresponse to the request for the connection, requesting an authorizationcredential from a separately located central server via thecommunications network to authorize a media streaming session, whereinthe authorization credential is generated and provided by the centralserver to both of the remote player and the server device via thecommunications network; and establishing the media streaming sessionbetween the server device and the remote player over the communicationsnetwork in response to receipt of the authorization credentialtransmitted by the central server so as to securely provide the mediastream from the server device to the remote player, wherein at least aportion of the media stream is encrypted based upon the authorizationcredential.
 2. The method of claim 1 further comprising verifying thatmedia streaming is approved between the server device and the remoteplayer prior to requesting the authorization credential, wherein theverifying is based at least in part upon a geographical location of theremote player.
 3. The method of claim 1 further comprising verifyingthat media streaming is approved between the server device and theremote player prior to requesting the authorization credential, whereinthe verifying is based at least in part upon an approval received via atelevision distribution medium separate from the communications network.4. The method of claim 1 wherein the authorization credential comprisesa symmetric encryption key that is also provided to the remote playerover the communications network in response to a request received fromthe remote player at the central server.
 5. The method of claim 4wherein the establishing of the media stream comprises negotiatingencryption parameters for the media stream based at least in part uponthe symmetric encryption key.
 6. The method of claim 1 wherein broadcastmedia content is received at the server device via a distribution mediumthat is separate from the communications network, and wherein thebroadcast media content is encoded by the server device to create themedia stream for transmission to the media player via the communicationsnetwork.
 7. The method of claim 6 further comprising verifying thatmedia streaming is approved between the server device and the remoteplayer prior to requesting the authorization credential, wherein theverifying is based at least in part upon an approval received via thesame distribution medium separate from the communications network thatprovides the media content.
 8. The method of claim 7 wherein the mediumseparate from the communications network comprises a satellite link. 9.A server system for securely providing a media stream of media contentto a device of a remote player via a communications network, the systemcomprising: a network interface to the communications network; atranscoder configured to encode the received media content for transportover the communications network; and a control circuit in communicationwith at least the network interface and the transcoder, wherein thecontrol circuit is configured to receive a request for a connection fromthe remote player via the network interface, and in response to theconnection request, to request an authorization credential from aseparately located central server via the network interface, wherein theauthorization credential is generated by the central server and providedby the central server to both of the remote player and the server systemvia the communications network to authorize a media streaming sessionbetween the remote player and the server system, and wherein the controlcircuit is further configured to direct the encrypting of the mediacontent to thereby create the encrypted media stream using theauthentication credential, and to transmit the encrypted media stream tothe remote player via the network interface.
 10. The system of claim 9wherein the control circuit is configured to use the authenticationcredential to negotiate encryption parameters for the media stream basedat least in part upon the received authorization credential.
 11. Thesystem of claim 9 wherein the control circuit is further configured touse the authentication credential to encrypt at least a portion of themedia stream.
 12. The system of claim 9 wherein the control circuit isfurther configured to verify that streaming is approved between thesystem and the remote player prior to requesting the authorizationcredential, wherein the verification is based upon an approval receivedvia a medium separate from the communications network.
 13. A centralcomputerized authentication system that allows a media stream to beprovided to a user of a remote player device, wherein the media streamis provided from a media streaming device to the remote player deviceover a communications network, the authentication system comprising ahardware processor, a memory and a network interface, wherein theauthentication system is separate from both the media streaming deviceand the remote player device, and wherein the processor of theauthentication system is configured to: receive, at the centralcomputerized authentication system separate from both of the mediastreaming device and the remote player device, a first request from theremote player device via the communications network, wherein the firstrequest comprises a user credential associated with the user; verify theuser credential by the central computerized authentication system and,in response to successful verification, transmit a first response to theremote player device that identifies the media streaming device on thecommunications network; and in response to a second request received atthe central computerized authentication system from the remote playerdevice that has received the first response, transmit a sharedauthentication credential from the central computerized authenticationsystem to both of the remote player device and the media streamingdevice to thereby allow the remote player device and the media streamingdevice to establish the media stream communications encrypted by theshared authentication credential.
 14. The central computerizedauthentication system of claim 13 wherein the media stream is encryptedat least in part based upon the authentication credential.
 15. Thecentral computerized authentication system of claim 13 wherein theauthentication credential is transmitted to the media streaming devicein response to a key request from the media streaming device.
 16. Thecentral computerized authentication system of claim 13 furthercomprising validating that the user is authorized to connect to themedia streaming device.
 17. The computerized authentication system ofclaim 16 wherein the validating comprises querying an account serverhaving an entry associated with the user.
 18. The computerizedauthentication system of claim 17 wherein the account server isassociated with a service provider providing media content to the mediastreaming device via a medium separate from the communications network,wherein the media stream comprises the media content that is receivedfrom the service provider via the separate medium and encoded fortransmission on the communications network by the media streamingdevice.
 19. The computerized authentication system of claim 13 whereinthe media stream comprises media content that is encoded by the mediastreaming device for transmission on the communications network, andwherein the media content is delivered to the media streaming device viaa medium separate from the communications network, and wherein theshared authentication credential is transmitted to the media streamingdevice at least in part via the medium that delivers the media contentto the media streaming device.
 20. The computerized authenticationsystem of claim 13 wherein the media stream comprises media content thatis encoded by the media streaming device for transmission on thecommunications network, and wherein the media content is delivered tothe media streaming device via a direct broadcast satellite mediumseparate from the communications network, and wherein the sharedauthentication credential is transmitted to the media streaming deviceat least in part via the direct broadcast satellite medium that deliversthe media content to the media streaming device.